Hoist hook block



Feb. 16, 1960` `55.1?R0B1Ns ETAL HOIST HOOK BLOCK VFiled. Dec. 13, 1955 y Fia-Z f INVENToRs' E/Pwra E. Ran/avc Holsr Hoox BLOCK Erford E. Robins, North Tonawanda, and Humphrey F. Parker and Loren W.' Lerch, Buffalo, N.Y., assignors to Columbia McKinnon Chain Corporation, Tonawanda, N.Y. f

Application December 13, 17955,'sena1N0. 552,934 1 claim. (ci. 294-78) This invention relatesto chain hoists, and more par- 'A y ticularly to improvements in thefload lift 'devices thereof such as are known as the lower hook block components of such mechanisms.

One of the objects of'the invention is to provide a struc-V Fig. 3 is a fragmentary section taken along line III-r III of Fig. 2; and f Y Fig. 4 is a section taken along line IV--IV of Fig. 3. In the drawing, the hook block of the invention is shown as being mounted in conjunction with a load lift 1 chain designated generally 10;l the hook block being desiguated generally at 12, and being shown as carrying a load lift hook 14. The block 12 comprises essentially a pair of semi-cylindrical half-block portions 16, 18 vwhichv are externally reduced to receive in slip-tting relation thereabout a lo'cking sleeve 20 which normally operates to hold the two halves together in assembled relation as shown in the drawing.A Adjacent their upper ends, the block halves 16, 18` are complementarily recessed at their contiguous faces as indicated at 22 to receive the lowermost link of chain 10. The block parts are also bored in transverse alignment 'so as to' receive therein opposite ends of a load chain anchor pin 24 which extends through the lowermost link of the chain 10, thus locking the hook block 12 to the load chain 10. The central body portions of the block halves 16, 18 are interiorly recessed as indicated at 26 and bored as indicated at 28v to accommodatein swivelable relation therein the shank portion 29 of the load lift hook 14 and a support collar therefor as indicated at 30. The collar 30 is fixed tothe upperend of ho'ok shank 29 by means of a transverse pin 32, and an end thrust bearing device as indicated at 34 is pref-` erably disposed below the collar `3l) so as to render the hook freely swivelable in the hook block 12.

Thus, it will be appreciated that the two block halvesA 16, 18 are symmetrically formed of generally semi-cylin-f drical shapes and adapted to clasp at opposite sides upon the chain anchor pin 24 and upon the shank and collar assembly of the lift hook 14; thereby locking upon these parts in such manner as to interconnect them while at the same time completing an outwardly cylindrical formation. The locking sleeve 20 is then slip-fitted downwardly upon the block halves so as to hold them in the i assembled relation shown in the drawing herewith; whereupon a snap ring or the like as indicated at 36v lis preferably sprung into a complementary-shaped peripherall 2,925,298 Patented Feb. 16, 1960 ICC . 2 Thus, it will be appreciated that the hook block of the invention is readily fabricated of inexpensively manufactured parts, and easily assembled to complete a hook blockof structurally simple yet rugged form which is compactly dimensioned and carries a-load lift hook in freely swivelable relation therebelow.

Although only one specific form of the invention has Y and opening onto the top thereof and receiving in transverse mounted relation therein a chain anchor pin and one end of a chainlink when engaged about said pin, the

llower end portions of said block part members being complementarily recessed at the contiguous faces thereof to present a bore opening through the bottom of said block and an enlarged chamber conned between the ends of the block, said bore accommodating in freely rotatable relation the shank portion of a hoist load lift hook, said chamber accommodating interorly of said block an enlarged collar surrounding the upper extremity A of said shank portion of said load lift hook, said collar being of a diameter just slightlynless than the diameter of said chamber and having a transverse `bore therethrough aligned with a transverse bore in said shank and receiving therethrough a pin, the last mentioned pin being of a length to substantially completely extend through said collar whereby the assembled block part members retain said last pin in operative position within said collar, said body part Vmembers at the bottom delining said chamber being flat, anrend thrust bearing surrounding said shank below said collar within said block and seated upon said at bottom of the chamber, said block having the major portion of its outersurface extending from a point above the bottom thereof upwardly through the top extremity thereof of reduced diameter, a locking sleeve slip tted about said block part members and covering the reduced diameter portionthereof in snugly iitting of said block partmembers having an annular groove therein, and a snap ring device velastieally engaged in said groove and overlying the upper extremity of said locking sleeve so as to thereby prevent unintended disassembly `of said locking sleeve relative to said block partV members.

lReferences Cited in the le of this patent UNITED STATESPATENTS Stahl Feb. 11, 1941 Jennings July 20, 1948 2,739,789 Smith l-.. Mar. 27, 1956 FOREIGN PATENTS 19,790 Great Britain -4-a Aus- 12, 19,15

Criswell Jan. 3, 1950` UNI-TED STATES PATENTfoEFICE cERTIFICA'IE- oF CORRECTION Patent No.. 2,925,298 February 16,l 1960 Error-d E.. Robins et al. I

It is herebyA certified that error appears in the above numbered patent requiring correction and that the said Letters Pate'rt Should read as corrected below.

In the grant, lines, 3 and 13.,v and in the heading to the printed specification, line 5r` name of assignee,v for v "Columbia McKinnon Chain Corp'ofration"t each occurrence,` read Columbus McKinnon Chain Corporation Signed and sealed this lth day of August 1960.

(SEAL) Attest:

KARL H AXLINE I ROBERT c. wATsoN t'besting Officer' I Conmissioner of Patents 

